Electronic circuit with compensation of intrinsic offset of...

Details Electronic circuit with compensation of intrinsic offset of... Electronic circuit with compensation of intrinsic offset of...

2006-12-12

2010-06-15

Pascal, Robert (Department: 2817)

Amplifiers

With periodic switching input-output

C327S065000

Reexamination Certificate

active

07737774

ABSTRACT:
The invention relates to analog integrated electronic circuits using differential pairs. The proposal is for a method of automatic correction of offset voltage. The inputs (V1, V2) of the differential circuit are short circuited during a calibration phase distinct from the normal usage phase. A capacitor is charged through the difference of the output currents of the branches of the differential pair in this phase. The voltage at the terminals of the capacitor is compared with at least one threshold. During the normal usage phase following the calibration phase, the result of the comparison is kept in memory. In the normal usage phase, a correction is applied depending on the result kept in memory to a current source of a follower stage upstream of the differential pair.

REFERENCES:
patent: 3434069 (1969-03-01), Jones
patent: 6114906 (2000-09-01), Fukui
patent: 2001/0007443 (2001-07-01), Ono

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